Trimming attachment for sewing-machines



(No Model.) 2 Sheets-Sheet 1.

G. M. MORRIS.

TRIMMING ATTAGHMENT FOR SEWING MACHINES. No. 268,812 Patented De0.12, 1882.

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G. M. MORRIS. TRIMMING ATTACHMENT FOR SEWING MACHINES.

No. 268,812. Patented Dec. 12, 1882.

Witnesses:

UNITED STATES PATENT OFFICE.

GEORGE M. MORRIS, OF OOHOES, ASSIGNOR OF ONE-TIALF TO W. IRVING BLEAKLEY, F LANSINGBURG, NEW YORK.

TRIMMlNG ATTACHMENT FOR SEWING MACHINES.

SPECIFICATION forming part of Letters Patent No. 268,812, dated December 12, 1882,

- Application filed May 16, 1882. (N0 model.) I

To all whom at may concern Be it known that I, GEORGE MARION Moa- RIS, of the city of Cohoes, county of Albany, and State of New York, have invented a new and useful Improvement in Attachments to Sewing-Machines, which trim the fabric being sewed, of which the following is a specification.

My invention relates to that class of devices which are attached to sewing-machines to trim off the edges of the fabric that is being sewed by the machine.

My invention consists in the combination of a hanger constructed with a toothed wheel having a shaft which is journaled in the lower end of the hanger, the teeth of the wheel being projected downwardly below thehanger sufficiently to engage with the passing fabric being fed into the machine, to keep the fabric in place with reference to theline of its feed, and to prevent its lateral distortion therefrom.

My invention also consists in the combination, with the table-plate of the machine, of a slot and toothed wheel constructed to turn therein, with its teeth projected above the top of the plate, so as to engage with the fabric and turn as the latter passes to the needle, an adjustable cutting-edge upon the table-plate,

' and ashear-blade having a cutting-edge which 0 is actuated to open and close along the cutting-edge of the table-plate.

Accompanying this specification and forming a part of it are two plates of drawings, containing five figures, which illustrate my invention and the parts of a sewing-machine with which they connect, and in all of these illustrations the same designation of parts by letter-reference is used.

Figure 1 is a view in perspective of the combined parts and the parts of a sewing-machine with which they connect. Fig. 2 is a plan view of the parts and their connection with the shaft of the sewing-machine by which they are actuated. Fig. 3 shows in perspective and as separated from the rest of the mechanism the shear-blade, rock-shaft, cran k-arm, pitman, and cam-pin constructed on the latter. Fig. 4 shows in vertical section the slot formed in the tableplate, part which forms the shear-edge, and 50 the toothed wheel constructed to turn in said slot, the view being taken on the line at a; of Fig. 2. Fig.5 shows in perspective and as disconnected from the other parts the camgrooved wheel upon the driving-shaft and-a portion of the latter. 7 t 5 5 The several parts of the mechanism are designated by letter-reference, and their operation thus described.

The letter A indicates a part of the tableplate, which is made laterally adjnstableat a, and having the interiorly-placed cutting shearedge at a.

The letter a indicates the table-plate proper,

,having the openingw" formed therein; and B designates a shear-blade, which is adjustably 6 keyed to the rock-shaft U at b,- and d d indicate two collars or sleeves, which at d are secured to the rock-shaft by set-screws.

The letter E designates a bridge-plate, which is attached to the table-plate proper at e, and having constructed within it bearings for the rock-shaft G to turn in, the bearings being indicated by a dotted line at 0 The letter F indicates a crank-arm keyed to the rock-shaft (J at f and journaled to the pitman G at g. This pitman is slotted at g for the passage of the driving-shaft, and is constructed with the cam-pin g on its lower end.

The driving-shaft of the machine is indi- 8o cated at H, and at P a wheel, which is keyed to said shaft, and which wheel has upon its vertical face 10 the ca m-groove 29'.

Within the slotted end of the pendent foot I there is produced the slot 0, and within the 8 latter, so as to have its shaft-bearings in the sides of this slot, is placed the toothed wheel O,with its teeth projected downwardly below the bottom of the foot.

Within the adjustable part of the table-plate. 0 indicated at A is formed the slot at, and with its shaft-bearings within the Walls of this slot is arranged the toothed wheel a, the teeth of the latter projecting upwardly above the top of the plate in which the slot is formed. 5

The letter K denotes the needle bar and. guide, L the needle, and M the presser-loot.

The machine to which my invention is shown as applied belongs to the class known as overseaming machines, the well-known parts of which, with the exception of those immediately connected with my invention, need not be named or described.

As constructed, the several factors constituting my invention operate as follows: When the driving-shaft H is actuated to turn there turns with it theca m-grooved wheel P, attached to this shaft. Within the cam-groove )9" formed in the vertical face of this wheel, is placed the enga gingcam-pin g, and this latter isattached to the lower end of the pitman G. As the cam-pin is moved around-in this eccentric groove the pit-man, which is slotted around the driving-shaft, is caused to rise and fall, and the upper end of this pitman at g beingjournaled to the crank-arm F, and the latter atf being keyed to the rockeshaft, the latter is caused to rock in its bearings, carrying with it, so as to have ajaw motion, the cuttingblade I B. As the cutting-edge of the latter opens and closes along the blade-edge of the plate A, as designated at a, the fabric passing to the needle is trimmed before being sewed. The fabric while being fed into the machine is kept from distortion laterally in the line of its feed by the toothed wheel in the hanger-foot and in the plate. 3

To secure the best results by this mechanism it is desirable that the cutting-blade should descend while the needle is in the fabric,which may be accomplished 'by arranging the campin on the pitman relatively in such a position with reference to the eccentricity of the groove as to produce such simultaneous descent of the needle and shear-blade. To keep the campin within the cam-groove of the wheel upon the shaft, a keeper-wheel may be arranged upon the shaft adjacent to the exterior face of the pitman.

The rock-shaft O is slotted at its blade end to receive the blade 13, and the latter is secured within the slot by the set-screw b, so that it can be moved outwardly or inwardly, and secured by the latter. The plate A, having the cuttingedge a, can also be moved outwardly and inwardly on the same line of adjustment as the blade, and held in position by means of the set-screw which connects it with the table, so that. the relative position of the trimming-line and the line of the stitching can be varied by moving out or in the former, so as to'increase or diminish the width of material between them.

While I have shown the bearings for the rock-shaft as produced in the bridge-plate E and the rock-shaft as held within them by the collars d d and set-screws (1 any equivalent bearings with the shaft secured therein so as .to prevent its being crowded laterally by the engaging jaw-edges will answer the same purpose.

Having thus described my invention, What I claim, and desire to secure by Letters Patent, IS

1. In an attachment to a sewing-machine, the combination of a vertical slot formed in a pendent foot with a toothed wheel having its shaft-bearings constructed in the sides of the. slot, the teeth of the wheel being projected below the lower end of the foot, as and for the purposes described and set forth.

2. In a fabric-trimming attachment to sewing-inachines, the combination ofa slot formed in the table-plate, a toothed wheel having its shaft-bearings constructed in the sides of said slot, an adjustable cnttingedge'upoi'i the tableplate, and a shear-blade having a cutting-edge which is actuated to open and close along the cutting-edge of the table-plate, in the manner and for the purposes herein described and set forth.

Signed at the city of Troy this 13th day of May, 1S82.-

GEORGE MAR-ION MORRIS.

Witnesses:

HORACE L. HIoKs, CHARLES S. BRINTNALL. 

